| 摘要 |
A method for estimating a lifetime of an organic EL element comprising a pair of electrodes and an organic layer, comprises: a step of acquiring degradation data of characteristics of the element when a current density applied to the element and/or an atmosphere temperature of the element are/is changed; a step of calculating a fitting function of the degradation data and extracting a degradation parameter characterizing a degradation in the characteristics at the applied current density and/or the atmosphere temperature from the fitting function; a step of calculating a temperature dependence of the degradation parameter based on a temperature rise value of the organic layer upon light emission at the applied current density and/or the atmosphere temperature and setting a lifetime estimation formula of the element; and a step of estimating the lifetime of the organic EL element based on the lifetime estimation formula. |
